Imitating what you see on porn sites is often a bad idea. Porn shoots usually edit out all the safety precautions that they are taking, which gives the viewer the idea that certain activities are safe when they aren't safe without the precautions.

"We hurt the ones we love the most. It's a subtle form of compliment."

1. They make sure that the actress is right for the scene. So if you see a woman sitting down on a 5 inch plug, it's safe to say that this is somewhat normal for her, cause it wouldn't be the same with someone who was not used to it.

2. They don't film all the preparation in getting someone's ass pliable and stretched enough to fit what's going in. Even for a pro, there are preliminaries... otherwise they'd have to wear a diaper all the time.

3. If you see someone spit on another's ass and then put something huge in it... they're not showing you reality. Asses don't lubricate on their own and spit won't cover enough or last enough.